组网需求

如图1所示，通过配置M-LAG双归接入IP网络可以满足以下要求：

当一条接入链路发生故障时，流量可以快速切换到另一条链路，保证可靠性。

为了高效利用带宽，两条链路同时处于active状态，可实现使用负载分担的方式转发流量。

配置思路

采用如下的思路配置M-LAG双归接入IP网络：

在Switch上配置上行接口绑定在一个Eth-Trunk中。
分别在SwitchA和SwitchB上配置V-STP、DFS Group、peer-link和M-LAG接口。
分别在SwitchA和SwitchB上配置VLANIF接口IP地址和MAC地址，作为接入设备的双活网关。
分别在SwitchA、SwitchB和SwitchC上配置OSPF功能，保证三层互通。
分别在SwitchA和SwitchB上配置Monitor Link关联上行接口和下行接口，避免因上行链路故障导致用户侧流量无法转发而丢弃。

操作步骤

在Switch上配置上行接口绑定在一个Eth-Trunk中

# 配置Switch。

<HUAWEI> system-view
[~HUAWEI] sysname Switch
[*HUAWEI] commit
[~Switch] vlan batch 11
[*Switch] interface eth-trunk 20
[*Switch-Eth-Trunk20] mode lacp-static
[*Switch-Eth-Trunk20] port link-type trunk
[*Switch-Eth-Trunk20] port trunk allow-pass vlan 11
[*Switch-Eth-Trunk20] trunkport 10ge 1/0/1 to 1/0/4
[*Switch-Eth-Trunk20] quit
[*Switch] commit

分别在SwitchA和SwitchB上配置V-STP、DFS Group、peer-link和M-LAG接口

# 配置SwitchA。

<HUAWEI> system-view
[~HUAWEI] sysname SwitchA
[*HUAWEI] commit
[~SwitchA] stp mode rstp
[~SwitchA] stp bridge-address 1-1-1
[*SwitchA] stp v-stp enable
[*SwitchA] interface loopback 0
[*SwitchA-LoopBack0] ip address 10.1.1.1 32
[*SwitchA-LoopBack0] quit
[*SwitchA] dfs-group 1
[*SwitchA-dfs-group-1] source ip 10.1.1.1
[*SwitchA-dfs-group-1] priority 150
[*SwitchA-dfs-group-1] quit
[*SwitchA] interface eth-trunk 1
[*SwitchA-Eth-Trunk1] trunkport 10ge 1/0/4
[*SwitchA-Eth-Trunk1] trunkport 10ge 1/0/5
[*SwitchA-Eth-Trunk1] mode lacp-static
[*SwitchA-Eth-Trunk1] peer-link 1
[*SwitchA-Eth-Trunk1] quit
[*SwitchA] vlan batch 11
[*SwitchA] interface eth-trunk 10
[*SwitchA-Eth-Trunk10] mode lacp-static
[*SwitchA-Eth-Trunk10] port link-type trunk
[*SwitchA-Eth-Trunk10] port trunk allow-pass vlan 11
[*SwitchA-Eth-Trunk10] trunkport 10ge 1/0/2
[*SwitchA-Eth-Trunk10] trunkport 10ge 1/0/3
[*SwitchA-Eth-Trunk10] dfs-group 1 m-lag 1
[*SwitchA-Eth-Trunk10] quit
[*SwitchA] commit

# 配置SwitchB。

<HUAWEI> system-view
[~HUAWEI] sysname SwitchB
[*HUAWEI] commit
[~SwitchB] stp mode rstp
[~SwitchB] stp bridge-address 1-1-1
[*SwitchB] stp v-stp enable
[*SwitchB] interface loopback 0
[*SwitchB-LoopBack0] ip address 10.1.1.2 32
[*SwitchB-LoopBack0] quit
[*SwitchB] dfs-group 1
[*SwitchB-dfs-group-1] source ip 10.1.1.2
[*SwitchB-dfs-group-1] priority 120
[*SwitchB-dfs-group-1] quit
[*SwitchB] interface eth-trunk 1
[*SwitchB-Eth-Trunk1] trunkport 10ge 1/0/4
[*SwitchB-Eth-Trunk1] trunkport 10ge 1/0/5
[*SwitchB-Eth-Trunk1] mode lacp-static
[*SwitchB-Eth-Trunk1] peer-link 1
[*SwitchB-Eth-Trunk1] quit
[*SwitchB] vlan batch 11
[*SwitchB] interface eth-trunk 10
[*SwitchB-Eth-Trunk10] mode lacp-static
[*SwitchB-Eth-Trunk10] port link-type trunk
[*SwitchB-Eth-Trunk10] port trunk allow-pass vlan 11
[*SwitchB-Eth-Trunk10] trunkport 10ge 1/0/2
[*SwitchB-Eth-Trunk10] trunkport 10ge 1/0/3
[*SwitchB-Eth-Trunk10] dfs-group 1 m-lag 1
[*SwitchB-Eth-Trunk10] quit
[*SwitchB] commit

分别在SwitchA和SwitchB上配置VLANIF接口IP地址和MAC地址，作为接入设备的双活网关

两端的IP和虚拟MAC配置要求完全一致，目的是为M-LAG提供相同的IP和虚拟MAC。

# 配置SwitchA。

[~SwitchA] interface vlanif 11
[*SwitchA-Vlanif11] ip address 10.2.1.1 24
[*SwitchA-Vlanif11] mac-address 0000-5e00-0101
[*SwitchA-Vlanif11] quit
[*SwitchA] commit

# 配置SwitchB。

[~SwitchB] interface vlanif 11
[*SwitchB-Vlanif11] ip address 10.2.1.1 24
[*SwitchB-Vlanif11] mac-address 0000-5e00-0101
[*SwitchB-Vlanif11] quit
[*SwitchB] commit

分别在SwitchA、SwitchB和SwitchC上配置OSPF功能，保证三层互通

# 配置SwitchA。

[~SwitchA] interface 10ge 1/0/1
[~SwitchA-10GE1/0/1] undo portswitch
[*SwitchA-10GE1/0/1] ip address 10.3.1.1 24
[*SwitchA-10GE1/0/1] quit
[*SwitchA] ospf 1
[*SwitchA-ospf-1] area 0
[*SwitchA-ospf-1-area-0.0.0.0] network 10.1.1.1 0.0.0.0
[*SwitchA-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255
[*SwitchA-ospf-1-area-0.0.0.0] network 10.3.1.0 0.0.0.255
[*SwitchA-ospf-1-area-0.0.0.0] quit
[*SwitchA-ospf-1] quit
[*SwitchA] commit

# 配置SwitchB。

[~SwitchB] interface 10ge 1/0/1
[~SwitchB-10GE1/0/1] undo portswitch
[*SwitchB-10GE1/0/1] ip address 10.4.1.1 24
[*SwitchB-10GE1/0/1] quit
[*SwitchB] ospf 1
[*SwitchB-ospf-1] area 0
[*SwitchB-ospf-1-area-0.0.0.0] network 10.1.1.2 0.0.0.0
[*SwitchB-ospf-1-area-0.0.0.0] network 10.2.1.0 0.0.0.255
[*SwitchB-ospf-1-area-0.0.0.0] network 10.4.1.0 0.0.0.255
[*SwitchB-ospf-1-area-0.0.0.0] quit
[*SwitchB-ospf-1] quit
[*SwitchB] commit

# 配置SwitchC。

<HUAWEI> system-view
[~HUAWEI] sysname SwitchC
[*HUAWEI] commit
[~SwitchC] interface 10ge 1/0/1
[~SwitchC-10GE1/0/1] undo portswitch
[*SwitchC-10GE1/0/1] ip address 10.3.1.2 24
[*SwitchC-10GE1/0/1] quit
[*SwitchC] interface 10ge 1/0/2
[*SwitchC-10GE1/0/2] undo portswitch
[*SwitchC-10GE1/0/2] ip address 10.4.1.2 24
[*SwitchC-10GE1/0/2] quit
[*SwitchC] ospf 1
[*SwitchC-ospf-1] area 0
[*SwitchC-ospf-1-area-0.0.0.0] network 10.3.1.0 0.0.0.255
[*SwitchC-ospf-1-area-0.0.0.0] network 10.4.1.0 0.0.0.255
[*SwitchC-ospf-1-area-0.0.0.0] quit
[*SwitchC-ospf-1] quit
[*SwitchC] commit

分别在SwitchA和SwitchB上配置Monitor Link关联上行接口和下行接口

# 配置SwitchA。

[~SwitchA] monitor-link group 1
[*SwitchA-mtlk-group1] port 10ge 1/0/1 uplink
[*SwitchA-mtlk-group1] port eth-trunk 10 downlink 1
[*SwitchA-mtlk-group1] quit
[*SwitchA] commit

# 配置SwitchB。

[~SwitchB] monitor-link group 1
[*SwitchB-mtlk-group1] port 10ge 1/0/1 uplink
[*SwitchB-mtlk-group1] port eth-trunk 10 downlink 1
[*SwitchB-mtlk-group1] quit
[*SwitchB] commit

验证配置结果

执行命令display dfs-group，查看M-LAG的相关信息。

# 查看DFS Group编号为1的M-LAG信息。

[~SwitchA] display dfs-group 1 m-lag
*                : Local node
Heart beat state : OK
Node 1 *
  Dfs-Group ID   : 1
  Priority       : 150
  Address        : ip address 10.1.1.1
  State          : Master
  Causation      : -
  System ID      : 00e0-fc95-7c31
  SysName        : SwitchA
  Version        : V200R020C00
  Device Type    : CE6881
Node 2
  Dfs-Group ID   : 1
  Priority       : 120
  Address        : ip address 10.1.1.2
  State          : Backup
  Causation      : -
  System ID      : 00e0-fc95-7c11
  SysName        : SwitchB
  Version        : V200R020C00
  Device Type    : CE6881

# 查看SwitchA上的M-LAG信息。

[~SwitchA] display dfs-group 1 node 1 m-lag brief
* - Local node

M-Lag ID     Interface      Port State    Status                Consistency-check
       1     Eth-Trunk 10   Up            active(*)-active      --              


Failed reason:                                                                  
    1 -- Relationship between vlan and port is inconsistent                     
    2 -- STP configuration under the port is inconsistent                       
    3 -- STP port priority configuration is inconsistent                        
    4 -- LACP mode of M-LAG is inconsistent                                     
    5 -- M-LAG configuration is inconsistent                                    
    6 -- The number of M-LAG members is inconsistent

# 查看SwitchB上的M-LAG信息。

[~SwitchB] display dfs-group 1 node 2 m-lag brief
* - Local node

M-Lag ID     Interface      Port State    Status                Consistency-check
       1     Eth-Trunk 10   Up            active-active(*)      -- 


Failed reason:                                                                  
    1 -- Relationship between vlan and port is inconsistent                     
    2 -- STP configuration under the port is inconsistent                       
    3 -- STP port priority configuration is inconsistent                        
    4 -- LACP mode of M-LAG is inconsistent                                     
    5 -- M-LAG configuration is inconsistent                                    
    6 -- The number of M-LAG members is inconsistent

通过以上显示信息可以看到，“Heart beat state”的状态是“OK”，表明心跳状态正常；SwitchA作为Node 1，优先级为150，“State”的状态是“Master”；SwitchB作为Node 2，优先级为120，“State”的状态是“Backup”。同时“Causation”的状态是“-”，Node 1的“Port State”状态为“Up”，Node 2的“Port State”状态为“Up”，且Node 1和Node 2的M-LAG状态均为“active”，表明M-LAG的配置正确。